Communication Terminal Selective Channel Reporting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In OFDMA systems, the current method of reporting reception quality information from communication terminals to base stations results in increased control information overhead, as terminals need to periodically report reception quality across all frequency channels, leading to inefficient scheduling and higher overhead.
Innovation Solution
The communication terminal apparatus selectively reports reception quality information for only the best-performing channels, allowing the base station to allocate these channels for improved throughput while reducing control information overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If communication terminals periodically report reception quality information for all frequency channels to the base station, then the base station can perform scheduling based on complete channel quality data, but the control information overhead on the uplink increases significantly
Solution Approach 1:
The patent extracts only the essential channel quality information (reception quality of selected frequency channels) from the complete set of all frequency channels. Terminals select and report only relevant channels rather than all channels, thereby reducing control information overhead while maintaining sufficient scheduling accuracy at the base station.
Solution Approach 2:
Instead of reporting complete channel quality information for all frequency channels (excessive action), the patent implements partial reporting by having terminals select and report only a subset of frequency channels with significant reception quality characteristics. This partial action reduces overhead while preserving scheduling effectiveness.
2Measurement precision
If the base station performs scheduling based on reception quality information from all frequency channels, then scheduling accuracy is improved, but the processing complexity and time required increase
Solution Approach 1:
The base station extracts scheduling decisions based only on the subset of frequency channel quality information reported by terminals, rather than processing complete information from all frequency channels. This extraction approach maintains scheduling accuracy for selected channels while reducing processing complexity.
3Productivity
If communication terminals report reception quality information for all frequency channels, then the base station can allocate optimal channels, but the uplink bandwidth consumption increases
Solution Approach 1:
The patent extracts only the necessary reception quality information for selected frequency channels that terminals intend to use or that have significant quality characteristics. This extraction reduces uplink bandwidth consumption for control information while preserving the base station's ability to perform efficient channel allocation based on reported quality data.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
To perform scheduling for improving throughput, while suppressing control information amounts notified from communication terminal apparatuses. A communication terminal apparatus (200) that is provided with a receiving section (220) that receives a control signal from the communication control apparatus, a reception quality measuring section (250) that measures reception quality of each of the channels, a reception quality information generating section (260) which selects part of channels as selection channels from the plurality of channels, and generates reception quality information to notify the communication-destination apparatus of selection channel information for identifying selected selection channels and reception quality measurement results in the selected selection channels, and a transmitting section (290) that transmits the generated reception quality information to the communication control apparatus, wherein the receiving section (220) receives a data signal assigned to at least one channel contained in the selection channels from the communication control apparatus (100).